87765719 has 2 divisors, whose sum is σ = 87765720. Its totient is φ = 87765718.

The previous prime is 87765701. The next prime is 87765737. The reversal of 87765719 is 91756778.

It is a balanced prime because it is at equal distance from previous prime (87765701) and next prime (87765737).

It is a cyclic number.

It is not a de Polignac number, because 87765719 - 2⁸ = 87765463 is a prime.

It is a super-2 number, since 2×87765719² = 15405642863173922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87765749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43882859 + 43882860.

It is an arithmetic number, because the mean of its divisors is an integer number (43882860).

Almost surely, 2^87765719 is an apocalyptic number.

87765719 is a deficient number, since it is larger than the sum of its proper divisors (1).

87765719 is an equidigital number, since it uses as much as digits as its factorization.

87765719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740880, while the sum is 50.

The square root of 87765719 is about 9368.3359781767. The cubic root of 87765719 is about 444.4009428511.

The spelling of 87765719 in words is "eighty-seven million, seven hundred sixty-five thousand, seven hundred nineteen".